Allowance for Credit Losses - Aging of Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 13,700,374	$ 12,961,999
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	5,643	7,208
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	32,580	23,090
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	13,533	6,101
90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	11,259	12,416
Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	57,372	41,607
Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	13,643,002	12,920,392
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,043,807	2,087,099
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	1,445	740
Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,447	1,195
Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	858	1,195
Commercial and Industrial | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,883	1,318
Commercial and Industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	6,188	3,708
Commercial and Industrial | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,037,619	2,083,391
Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,103,310	3,639,623
Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,000	631
Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	657
Commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	727
Commercial real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,384	631
Commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,099,926	3,638,992
Construction
Financing Receivable, Recorded Investment, Past Due
Loans and leases	765,862	813,969
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	390
Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	28	162
Construction | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	483
Construction | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	511	162
Construction | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	765,351	813,807
Lease financing
Financing Receivable, Recorded Investment, Past Due
Loans and leases	305,838	231,394
Lease financing | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	305,838	231,394
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,252,041	4,083,367
Loans and Leases Past Due 90 Days or More and Still Accruing Interest		987
Residential Mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	373	3,030
Residential Mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,943	1,002
Residential Mortgage | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,358	5,617
Residential Mortgage | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	7,674	9,649
Residential Mortgage | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,244,367	4,073,718
Home equity Line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,010,631	876,608
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	1,832	3,681
Home equity Line | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,536	1,538
Home equity Line | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,888	538
Home equity Line | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,832	3,681
Home equity Line | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	8,256	5,757
Home equity Line | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,002,375	870,851
Consumer
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,218,885	1,229,939
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	1,976	1,800
Consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	24,196	16,534
Consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	5,187	3,366
Consumer | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,976	1,800
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	31,359	21,700
Consumer | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,187,526	1,208,239
Residential Lending: Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,252,041	4,083,367
Residential Lending: Home Equity Line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 1,010,631	$ 876,608